3. [5pt] Choose the correct statements from the following. (Give ALL correct ans

Question

3. [5pt] Choose the correct statements from the following. (Give ALL correct answers, i.e., B, AC, BCD..) A) Gas falling into a black hole gives off X-rays B) All stars that have a mass greater than the Sun will end up as a black hole C) The unseen companion to V404 Cygnus is thought to be a likely candidate for a black hole. D) Black holes emit light through their event horizon. E) Type II supernovae occur in stars that have a final mass greater than 10 times the mass of the Sun F) A black hole is an object whose escape velocity is greater than the speed of light G) If the Sun collapsed into a black hole the Earth and all the inner planets would be sucked into it Answer: Submit All Answers

Explanation / Answer

A) - The X-rays come from hot gas orbiting around the black hole in an accretion disk. Many times gas (or even entire stars) are sucked inside the black hole, the material is accelerated and heated to very high temperatures.This in turn results in the emission of X-ray light.

C) - Theories suggest invisible object in V404 cygni must be a black hole.

E) - Type 2nd  supernova should have several times more massive than the sun (at least 8 Times mass of sun).

F) - Escape velocity of black hole should atleast be equal to speed of light , so anything with an escape velocity greater than the speed of light is a black hole.

so Correct statements are - (ACEF)

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